Title: Removal of Asphaltene Content from two Crude Oil Grades Using Paraffins Solvents
Two crude oil A and B of different API gravity was collected, and their asphaltene content was analysed using paraffin’s solvents, and further drying process was conducted at room temperature. The measure of the solvents from 200mL, 150mL, 100mL and 50mL was well measured and assembles in which therefore was pour into a 250mL beaker with each crude oil (A, B) mass of 5g. The mixture of each crude oil types with a specific volume of the three solvents pentane, hexane and heptane was gently mixed and stirred homogeneously at 170 rates per revolution (rpm). The asphaltene content obtained in all ratios from (40:1) in which 200mL was poured into the 5g of crude oil, (30:1) in which 150mL was poured into 5g of crude, (20:1) in which 100mL was poured into 5g of crude oil and lastly (20:1)* in which 50mL was poured into 2.5g of crude oil. The procedures were therefore repeated for the rest of the two solvents hexane and heptane. Pentane extracted more asphaltene than other two remaining solvents. It was observed that, single solvent for ratio (40:1) had removed 6.6g/mL asphaltene content, ratio (30:1) 11g/mL, (20:1) 9.2g/mL and (20:1)* 13.2g/mL asphaltene content. The greater asphaltene content was obtained on pentane in crude oil A sample in which had the same outcome for crude oil B and C. Solvent to solvent ratio in which two solvents mixed are the same time at (1:1) on the basis of 100mL of each solvent with the total of 200mL for the mixture was carefully conducted. The mixture of pentane and hexane (C5+C6) had the greater ability to extract the asphaltene content from the two crude oil A, and B follow by Pentane and heptanes (C5+C7) lastly Hexane and Heptane (C6+C7). The solvent to the solvent ratio (C5+C6) for crude oil A had 11.6g/mL, and for crude oil, B had 11.6g/mL. Lastly solvent to the solvent ratio (3:1) which 75mL of each selective solvent of the three mixed with 25mL each solvent of the same was conducted as well. It was noticed that this ratio (3:1) extracted more asphaltene than any other ratio within crude oil A and B. However the best optimiser was conducted at (C6+C5).
Keywords: Asphaltene; Solvents; Paraffins; Precipitation